2026 Climate Averages

Weather: Brussels — September

The weather is near-perfect with ideal temperatures and minimal rain. Recommended month to visit.

🌟 Climate Overview

September is an excellent time to visit Brussels. Warm weather with highs of 21°C—great for outdoor activities. Rain is common, so pack an umbrella. As peak season, expect higher prices and more tourists.

6.1
GoTripzi Score Good

Based on weather comfort, crowds, prices, and activity options

Avg High

21°C

Avg Low

12°C

Rainy days

12days

Daylight

12.7h

Rainfall

74mm

Sunshine

8.8h/day

Humidity

78%

Humid
Sun Strength

4.8

Moderate
Wind

18 km/h (gusts 36)

Is September a good time to visit Brussels?

The weather is near-perfect with ideal temperatures and minimal rain.

Now

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Feels like --
Wind --
Humidity --
UV Index --
Local time —

Air Quality

Travel Context

  • Crowds
    Very Busy
  • Travel Costs Peak Rates

Daylight

Sunrise

07:18

Sunset

19:59

12.7h daylight

Visiting Brussels in September: Pros & Cons

Pros

  • Comfortable temperatures for sightseeing
  • One of the best months to visit

Cons

  • Peak season — expect crowds and higher prices

Things to Do in September

Events & Festivals

🎭
Brussels Comic Strip Festival
September Cultural

Recommended for This Weather

🥾 Hiking & nature trails
🏛️ Museums & galleries
🍳 Cooking classes & food tours
🎭 Cultural tours & local experiences

Brussels Weather by Month

Month Avg High Avg Low Rain Sunshine Humidity UV Index Crowds Condition
Jan 7°C 2°C 12d (85mm) 3.5h
88% Very Humid
1.2 Low
Good
Feb 9°C 4°C 13d (71mm) 4.8h
82% Very Humid
2.2 Moderate
Wet
Mar 12°C 4°C 12d (58mm) 7.4h
74% Humid
4.3 Moderate
Good
Apr 15°C 6°C 10d (47mm) 9.8h
70% Humid
6.6 High
Good
May 19°C 9°C 11d (65mm) 10.8h
71% Humid
7.6 Very High
Excellent
Jun 23°C 13°C 11d (81mm) 11.3h
71% Humid
8.1 Very High
Excellent
Jul 23°C 14°C 12d (76mm) 11.1h
73% Humid
7.4 Very High
Excellent
Aug 24°C 15°C 12d (62mm) 10.8h
73% Humid
6.7 High
Excellent
Sep Current 21°C 12°C 12d (74mm) 8.8h
78% Humid
4.8 Moderate
Excellent
Oct 16°C 10°C 14d (88mm) 5.8h
84% Very Humid
2.6 Moderate
Wet
Nov 11°C 6°C 13d (65mm) 4h
88% Very Humid
1.4 Low
Wet
Dec 8°C 4°C 13d (73mm) 2.8h
89% Very Humid
0.8 Low
Wet

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Your Best MonthNovScore: 6.7
1.Nov
6.72.Oct
6.23.Feb
5.84.Dec
5.85.Mar
5.66.Apr
5.67.Jun
5.28.Jul
5.29.Aug
5.210.Jan
4.711.May
4.312.Sep
4.3

Where to Stay

See hotels, apartments & rentals around Brussels – live prices from Booking.com, Expedia, Vrbo and more

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Brussels

Grand Place, Manneken Pis, Art Nouveau architecture, Belgian waffles, and European capital flair.

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What to Pack for September

Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions. A waterproof jacket and shoes are non-negotiable — showers are frequent.

Cool Very Busy

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📋Essentials
👕Clothing
👟Footwear
🎒Accessories
🧴Toiletries & Health

Planning a trip to Brussels?

🔥 Peak season — book early for best rates

Frequently Asked Questions

Is September a good time to visit Brussels?
September is typically excellent for visiting Brussels, with average highs of 21°C and around 12 rainy days. Plan your activities accordingly—outdoor sightseeing is best on dry days, while rainy days are perfect for museums and indoor attractions.
Does it get cold at night in Brussels in September?
Evenings in Brussels during September are mild at 12°C. A light cardigan or long sleeves for evenings is usually enough. Outdoor dining remains comfortable, making it a great time to enjoy rooftop bars and terrace restaurants.
What should I pack for Brussels in September?
With highs of 21°C and lows of 12°C in September, we recommend: Warm layer for evenings, Compact umbrella, Waterproof jacket/shell, Sunscreen SPF 30+. Layering is key as temperatures can vary between air-conditioned interiors and outdoors. Comfortable walking shoes are essential for cobblestone streets.
Does it rain a lot in Brussels in September?
Brussels typically sees around 12 rainy days in September. Rain is usually in the form of brief showers rather than all-day downpours, so a compact umbrella is sufficient. Mornings tend to be drier, making them ideal for outdoor sightseeing.
How many hours of daylight are there in Brussels in September?
In September, Brussels gets approximately 12.7 hours of daylight per day. This affects how much sightseeing you can fit in—longer days mean more time for outdoor activities, while shorter days are perfect for cozy museum visits and early dinners.
Is September peak season in Brussels?
Yes, September is peak season in Brussels. Expect higher prices for accommodation and more crowds at popular attractions, but also the best weather conditions. Book hotels and major attractions in advance to secure availability and better rates.

Weather Data: Based on 2020–2025 historical climate data from Open-Meteo

Solar calculations: SunCalc (timezone: Europe/Brussels)

Last Updated: February 2026

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